Waste heat recovery heat exchanger

Abstract

A waste heat recovery heat exchanger belongs to the technical field of heat exchange equipment and comprises a high-temperature waste heat collecting box, a low-temperature waste heat collecting box, a heat exchanger box body, a heat exchanger tube plate, a heat exchange tube group and a heat exchange water tank, and the high-temperature waste heat collecting box and the low-temperature waste heat collecting box are fixedly welded to the two sides of the heat exchanger box body and the two sides of the heat exchanger tube plate respectively. The high-temperature waste heat collecting box is connected with a waste heat inlet pipeline, the low-temperature waste heat collecting box is connected with a waste heat outlet pipeline, the heat exchange tube group and the heat exchanger tube plate are fixed through welding or expanded connection, the heat exchanger tube plate and the heat exchange water tank are connected through welding, and a hot water inlet pipeline and a hot water outlet pipeline are connected above the heat exchange water tank. The waste heat recovery heat exchanger fundamentally avoids the low-temperature condensation corrosion problem of equipment, adopts anti-corrosion materials, has good corrosion resistance, can greatly reduce the use temperature of waste heat, effectively recovers a large amount of medium and low temperature waste heat, greatly improves the heat exchange performance of the waste heat recovery heat exchanger, and realizes efficient utilization of industrial waste heat resources.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchange equipment, and specifically relates to a waste heat recovery heat exchanger. Background Art

[0002] The emission standards of atmospheric pollutants are becoming increasingly stringent, and end-of-pipe treatment has begun to shift towards source reduction and process control. Energy conservation and emission reduction is a basic national policy of my country and an extremely urgent task facing my country in achieving a major strategic guarantee for sustainable development. my country's industrial energy consumption accounts for more than 70% of the total energy consumption, of which at least 50% is converted into industrial waste heat with different carriers and temperatures, most of which can be recycled. However, my country's current low-temperature industrial waste heat resource recovery rate and energy utilization efficiency are relatively low. Low-temperature waste heat resources such as industrial flue gas usually have the characteristics of high dust content and corrosiveness, which can easily cause a series of serious problems such as corrosion of waste heat recovery heat exchangers. How to control the temperature of the waste heat recovery heat exchanger, solve the problem of low-temperature corrosion of the heat exchanger, and achieve efficient utilization of waste heat resources has become a technical problem that needs to be urgently solved by technical personnel in this field. Utility Model Content

[0003] In order to solve the low-temperature corrosion problem of industrial waste heat exchangers and realize the efficient utilization of industrial waste heat resources, the utility model provides a waste heat recovery heat exchanger, which is composed of a high-temperature waste heat collection box, a low-temperature waste heat collection box, a heat exchanger box, a heat exchanger tube sheet, a heat exchange tube group, and a hot water tank. The control system monitors the temperature of the waste heat inlet temperature sensor, the waste heat outlet temperature sensor, the hot water inlet temperature sensor, and the hot water outlet temperature sensor in real time, adjusts the opening of the hot water control valve, and controls the hot water flow entering the hot water tank of the waste heat recovery heat exchanger, so that the waste heat temperature and the wall surface of the heat exchanger tube sheet are always kept relatively stable, and the wall surface temperature is uniform as a whole. , which can always control the waste heat temperature above the acid dew point temperature, fundamentally avoiding the problem of low-temperature condensation corrosion of the equipment. At the same time, the high-temperature waste heat collection box, low-temperature waste heat collection box, heat exchanger box, heat exchanger tube sheet, heat exchanger tube group, waste heat inlet pipeline, waste heat outlet pipeline and other surfaces used in the waste heat recovery heat exchanger are made of anti-corrosion materials, so that the waste heat recovery heat exchanger has good corrosion resistance. Therefore, on the basis of conventional heat pipe heat exchangers, the waste heat use temperature can be further greatly reduced, so that a large amount of medium and low temperature waste heat energy can be effectively recovered, the heat exchange performance of the waste heat recovery heat exchanger is greatly improved, and the efficient utilization of industrial waste heat resources is realized.

[0004] The technical solution adopted by the utility model to achieve the above-mentioned purpose is: a waste heat recovery heat exchanger, including a high-temperature waste heat collection box, a low-temperature waste heat collection box, a heat exchanger box body, a heat exchanger tube sheet, a heat exchange tube group, and a water exchange tank, wherein the high-temperature waste heat collection box and the low-temperature waste heat collection box are respectively welded and fixed on both sides of the heat exchanger box body and the heat exchanger tube sheet, the high-temperature waste heat collection box is connected to the waste heat inlet pipeline, the low-temperature waste heat collection box is connected to the waste heat outlet pipeline, the heat exchange tube group and the heat exchanger tube sheet are fixed by welding or expansion, the heat exchanger tube sheet and the water exchange tank are connected by welding, and the hot water inlet pipeline and the hot water outlet pipeline are connected above the water exchange tank.

[0005] A waste heat inlet temperature sensor is arranged on the waste heat inlet pipeline, a waste heat outlet temperature sensor is arranged on the waste heat outlet pipeline, a hot water inlet temperature sensor is arranged on the hot water inlet pipeline, a hot water outlet temperature sensor is arranged on the hot water outlet pipeline, and a hot water control valve is also arranged on the hot water outlet pipeline. The hot water control valve is a converging three-way hot water control valve. The hot water inlet pipeline and the hot water control valve are connected by a hot water bypass pipeline. The waste heat inlet temperature sensor, the waste heat outlet temperature sensor, the hot water inlet temperature sensor, the hot water outlet temperature sensor, and the hot water control valve are respectively connected to the control system.

[0006] A manual stop valve A and a manual stop valve B are respectively arranged on the hot water outlet pipeline on both sides of the hot water control valve, and a manual stop valve C is arranged on the hot water bypass pipeline.

[0007] The surfaces of the high-temperature waste heat collection box, the low-temperature waste heat collection box, the heat exchanger box, the heat exchanger tube sheet, the heat exchange tube group, the waste heat inlet pipeline, and the waste heat outlet pipeline are all made of anti-corrosion materials.

[0008] The beneficial effects of the utility model are as follows: by analyzing the causes and influencing factors of low-temperature corrosion of the heat exchange surface of the waste heat exchanger, the industry expansion of the industrial waste heat utilization system based on absorption heat exchange is concentratedly developed, the industrial waste heat utilization market is expanded through industrial waste heat recovery heat exchangers, and the integration of industrial waste heat recovery systems is realized. A waste heat recovery heat exchanger is used to directly and efficiently recover industrial waste heat resources to produce high-temperature hot water. The high-temperature hot water produced can drive the warm water type lithium bromide unit to produce cold water or hot water, realize cooling in summer, heating in winter, and provide sanitary hot water, realize industrial waste heat recovery, achieve the purpose of energy conservation and emission reduction, reduce the consumption of other high-grade energy, and at the same time maximize energy conservation and emission reduction, reduce pollutant emissions, and monitor the temperatures of the waste heat inlet temperature sensor, the waste heat outlet temperature sensor, the hot water inlet temperature sensor, and the hot water outlet temperature sensor in real time through the control system to adjust the opening of the hot water control valve and control the water tank entering the waste heat recovery heat exchanger. The hot water flow rate keeps the waste heat temperature and the wall of the heat exchanger tube sheet relatively stable, and the wall temperature is uniform as a whole, which can always control the waste heat temperature above the acid dew point temperature, fundamentally avoiding the problem of low-temperature condensation corrosion of the equipment. At the same time, the high-temperature waste heat collection box, low-temperature waste heat collection box, heat exchanger box, heat exchanger tube sheet, heat exchanger tube group, waste heat inlet pipeline, waste heat outlet pipeline and other surfaces used in the waste heat recovery heat exchanger are made of anti-corrosion materials, so that the waste heat recovery heat exchanger has good corrosion resistance. Therefore, on the basis of conventional heat pipe heat exchangers, the waste heat use temperature can be further greatly reduced, so that a large amount of medium and low temperature waste heat energy can be effectively recovered, the heat exchange performance of the waste heat recovery heat exchanger is greatly improved, the miniaturized design of the heat exchanger is realized, the heat exchanger structure is more compact, and the floor space is greatly reduced. With the concept of circular economy, energy conservation and consumption reduction and effective control of pollution sources are implemented, further enhancing the sustainable development of enterprises and realizing the effective use of energy. The economic and social benefits are very significant. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the structure of a waste heat recovery heat exchanger of the utility model;

[0010] In the figure: 1-high temperature waste heat collection box, 2-low temperature waste heat collection box, 3-heat exchanger box, 4-heat exchanger tube sheet, 5-heat exchange tube group, 6-heat exchange water tank, 7-waste heat inlet pipeline, 8-waste heat outlet pipeline, 9-hot water inlet pipeline, 10-hot water outlet pipeline, 11-waste heat inlet temperature sensor, 12-waste heat outlet temperature sensor, 13-hot water inlet temperature sensor, 14-hot water outlet temperature sensor, 15-hot water bypass pipeline, 16-hot water control valve, 17-manual stop valve A, 18-manual stop valve B, 19-manual stop valve C, 20-control system. DETAILED DESCRIPTION

[0011] The utility model is further described below in conjunction with the accompanying drawings: Example

[0012] like Figure 1 The waste heat recovery heat exchanger shown in the figure comprises a high-temperature waste heat collection box 1, a low-temperature waste heat collection box 2, a heat exchanger box body 3, a heat exchanger tube sheet 4, a heat exchange tube group 5, and a water exchange tank 6, wherein the high-temperature waste heat collection box 1 and the low-temperature waste heat collection box 2 are respectively welded and fixed on both sides of the heat exchanger box body 3 and the heat exchanger tube sheet 4, the high-temperature waste heat collection box 1 is connected to the waste heat inlet pipeline 7, the low-temperature waste heat collection box 2 is connected to the waste heat outlet pipeline 8, the heat exchange tube group 5 and the heat exchanger tube sheet 4 are fixed by welding or expansion, and the heat exchanger tube sheet 4 and the water exchange tank 6 are connected by welding. Through welding connection, the hot water inlet pipeline 9 and the hot water outlet pipeline 10 are connected above the water exchange tank 6. When the waste heat recovery heat exchanger recovers industrial waste heat, the high-temperature waste heat enters the high-temperature waste heat collection box 1 through the waste heat inlet pipeline 7 and then is recycled through the heat exchange tube group 5. After the high-temperature waste heat is cooled, it is collected in the low-temperature waste heat collection box 2 and finally discharged through the waste heat outlet pipeline 8, thereby realizing the effective utilization of industrial waste heat resources; hot water enters the water exchange tank 6 from the hot water inlet pipeline 9, is countercurrently exchanged with the waste heat, and then flows out from the hot water outlet pipeline 10 to heat up.

[0013] A waste heat inlet temperature sensor 11 is arranged on the waste heat inlet pipeline 7, a waste heat outlet temperature sensor 12 is arranged on the waste heat outlet pipeline 8, a hot water inlet temperature sensor 13 is arranged on the hot water inlet pipeline 9, a hot water outlet temperature sensor 14 is arranged on the hot water outlet pipeline 10, and a hot water control valve 16 is also arranged on the hot water outlet pipeline 10. The hot water control valve 16 is a converging three-way hot water control valve. The hot water inlet pipeline 9 and the hot water control valve 16 are connected through a hot water bypass pipeline 15. The waste heat inlet temperature sensor 11, the waste heat outlet temperature sensor 12, the hot water inlet temperature sensor 13, the hot water outlet temperature sensor 14, and the hot water control valve 16 are respectively connected to the control system 20. The control system 20 monitors the temperatures of the waste heat inlet temperature sensor 11, the waste heat outlet temperature sensor 12, the hot water inlet temperature sensor 13, and the hot water outlet temperature sensor 14 in real time, adjusts the opening of the hot water control valve 16, and controls the hot water flow rate entering the water exchange tank 6 of the waste heat recovery heat exchanger. When the temperature detected by the waste heat outlet temperature sensor 12 is lower than the set temperature or the temperature detected by the hot water inlet temperature sensor 13 and the hot water outlet temperature sensor 14 is lower than the set temperature, the opening of the hot water control valve 16 is reduced to reduce the hot water flow rate entering the water exchange tank 6; when the temperature detected by the waste heat outlet temperature sensor 12 is higher than the set temperature, the opening of the hot water control valve 16 is increased to increase the hot water flow rate entering the water exchange tank 6, so that the waste heat temperature and the heat exchanger tube sheet are in good contact. The wall surface of 4 always remains relatively stable, and the wall temperature is uniform as a whole, which can always control the waste heat temperature above the acid dew point temperature, fundamentally avoiding the problem of low-temperature condensation corrosion of the equipment. At the same time, the surfaces of the high-temperature waste heat collection box 1, the low-temperature waste heat collection box 2, the heat exchanger box 3, the heat exchanger tube sheet 4, the heat exchanger tube group 5, the waste heat inlet pipeline 7, and the waste heat outlet pipeline 8 used in the waste heat recovery heat exchanger are made of anti-corrosion materials, so that the waste heat recovery heat exchanger has good corrosion resistance. Therefore, on the basis of conventional heat pipe heat exchangers, the waste heat use temperature can be further greatly reduced, so that a large amount of medium and low temperature waste heat energy can be effectively recovered, the heat exchange performance of the waste heat recovery heat exchanger is greatly improved, the miniaturized design of the heat exchanger is realized, the heat exchanger structure is more compact, and the floor space is greatly reduced.

[0014] Manual stop valve A17 and manual stop valve B18 are respectively arranged on both sides of the hot water outlet pipeline 10, and a manual stop valve C19 is arranged on the hot water bypass pipeline 15. When the waste heat recovery heat exchanger works normally, the manual stop valve A17, manual stop valve B18, and manual stop valve C19 are opened. When the hot water control valve 16 needs to be repaired, the manual stop valve A17, manual stop valve B18, and manual stop valve C19 are closed.

[0015] The present utility model is not limited to the above-mentioned implementation modes, and anyone should be aware that any technical solution identical or similar to the present utility model made under the inspiration of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A waste heat recovery heat exchanger, characterized in that: The invention comprises a high-temperature waste heat collection box (1), a low-temperature waste heat collection box (2), a heat exchanger box (3), a heat exchanger tube sheet (4), a heat exchange tube group (5), and a water exchange tank (6), wherein the heat exchanger box (3) and the heat exchanger tube sheet (4) are respectively fixedly connected to the high-temperature waste heat collection box (1) and the low-temperature waste heat collection box (2), the high-temperature waste heat collection box (1) is connected to a waste heat inlet pipeline (7), the low-temperature waste heat collection box (2) is connected to a waste heat outlet pipeline (8), the heat exchange tube group (5) and the heat exchanger tube sheet (4) are fixedly connected, the heat exchanger tube sheet (4) is connected to the water exchange tank (6), and the top of the water exchange tank (6) is connected to a hot water inlet pipeline (9) and a hot water outlet pipeline (10).

2. A waste heat recovery heat exchanger according to claim 1, characterized in that: A waste heat inlet temperature sensor (11) is provided on the waste heat inlet pipeline (7), a waste heat outlet temperature sensor (12) is provided on the waste heat outlet pipeline (8), a hot water inlet temperature sensor (13) is provided on the hot water inlet pipeline (9), a hot water outlet temperature sensor (14) is provided on the hot water outlet pipeline (10), and a hot water control valve (16) is also provided on the hot water outlet pipeline (10). The hot water control valve (16) is a converging three-way hot water control valve. The hot water inlet pipeline (9) and the hot water control valve (16) are connected via a hot water bypass pipeline (15). The waste heat inlet temperature sensor (11), the waste heat outlet temperature sensor (12), the hot water inlet temperature sensor (13), the hot water outlet temperature sensor (14), and the hot water control valve (16) are respectively connected to a control system (20).

3. A waste heat recovery heat exchanger according to claim 2, characterized in that: A manual stop valve A (17) and a manual stop valve B (18) are respectively arranged on both sides of the hot water outlet pipeline (10) of the hot water control valve (16), and a manual stop valve C (19) is arranged on the hot water bypass pipeline (15).

4. A waste heat recovery heat exchanger according to any one of claims 1 to 3, characterized in that: The high-temperature waste heat collection box (1) and the low-temperature waste heat collection box (2) are respectively welded and fixed on both sides of the heat exchanger box body (3) and the heat exchanger tube sheet (4); the heat exchanger tube sheet (4) and the heat exchange water tank (6) are welded; and the heat exchange tube group (5) and the heat exchanger tube sheet (4) are fixedly connected by welding or expansion.

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